<template>
<div>
    <!-- 面包屑 -->
    <my-bread level1="商品管理" level2="商品分类"></my-bread>
    <!-- 卡片视图区域 -->
    <el-card>
        <el-row>
            <el-col>
                <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
            </el-col>
        </el-row>
        <!-- 表格 -->
        <tree-table :data="catelist" :columns="columns" :selection-type="false" :expand-type="false" show-index index-text="#" border class="treetable">
            <!-- 是否有效 -->
            <template slot="isok" slot-scope="scope">
                <i style="color:lightgreen" class="el-icon-success" v-if="scope.row.cat_delete==='false'"></i>
                <i style="color:lightgreen" class="el-icon-error" else></i>
            </template>
            <!-- 排序 -->
            <template slot="order" slot-scope="scope">
                <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
                <el-tag size="mini" type="success" v-else-if="scope.row.cat_level===1">二级</el-tag>
                <el-tag size="mini" type="warning" v-else>三级</el-tag>
            </template>
            <!-- 操作 -->
            <template slot="opt" slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditCateDialog(scope.row.cat_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeCate(scope.row.cat_id)">删除</el-button>
            </template>
        </tree-table>
        <!-- 分页区域 -->
        <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="queryInfo.pagenum" :page-sizes="[3,5,10,15]" :page-size="queryInfo.pagesize" layout="total, sizes, prev, pager, next, jumper" :total="total">
        </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
        <!-- 添加分类的表单 -->
        <el-form :model="addCateForm" :rules="addCateFormrules" ref="addCateFormRef" label-width="100px" class="demo-ruleForm">
            <el-form-item label="分类名称" prop="cat_name">
                <el-input v-model="addCateForm.cat_name"></el-input>
            </el-form-item>
            <el-form-item label="父级分类">
                <!-- options指定数据源  props指定数据对象-->
                <el-cascader expand-trigger='hover' v-model="selectedKeys" :options="parentCateList" :props="cascaderProps" @change="parentCateChanged" style="width:100%" clearable change-on-select></el-cascader>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addCateDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addCate">确 定</el-button>
        </span>
    </el-dialog>
    <!-- 编辑分类的对话框 -->
    <el-dialog title="编辑分类" :visible.sync="editCateDialogVisible" width="50%">
        <el-form :model="editCateForm" :rules="editCateFormRules" ref="editCateFormRef" label-width="100px">
            <el-form-item label="分类名称：" prop="cat_name">
                <el-input v-model="editCateForm.cat_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editCateDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="eidtCate">确 定</el-button>
        </span>
    </el-dialog>
</div>
</template>

<script>
export default {
    data() {
        return {
            // 查询条件
            queryInfo: {
                type: 3,
                pagenum: 1,
                pagesize: 5
            },
            // 商品分类数据列表
            catelist: [],
            // 总数据条数
            total: 0,
            // 为table指定列的定义
            columns: [{
                label: '分类名称',
                prop: 'cat_name'
            }, {
                label: '是否有效',
                // 表示当前列定义为模板列
                type: 'template',
                // 模板名称
                template: 'isok'
            }, {
                label: '排序',
                // 表示当前列定义为模板列
                type: 'template',
                // 模板名称
                template: 'order'
            }, {
                label: '操作',
                // 表示当前列定义为模板列
                type: 'template',
                // 模板名称
                template: 'opt'
            }],
            // 控制添加分类对话框的显示与隐藏
            addCateDialogVisible: false,
            // 控制编辑分类对话框的显示与隐藏
            editCateDialogVisible: false,
            // 添加分类表单数据
            addCateForm: {
                cat_name: '',
                // 父级分类的id
                cat_pid: 0,
                // 默认添加一级分类
                cat_level: 0
            },
            // 添加分类表单验证规则
            addCateFormrules: {
                cat_name: [{
                    required: true,
                    message: '请输入分类名称',
                    trigger: 'blur'
                }, ]
            },
            // 父级分类数据列表
            parentCateList: [],
            // 指定级联选择器的配置对象
            cascaderProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 选中的父级分类的id数组
            selectedKeys: [],
            // 编辑分类表单验证
            editCateFormRules: {
                cat_name: [{
                    required: true,
                    message: '请输入分类名称',
                    trigger: 'blur'
                }]
            },
            // 编辑表单 绑定对象
            editCateForm: ''
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList() {
            const res = await this.$http.get('categories', {
                params: this.queryInfo
            })
            const {
                data,
                meta: {
                    status,
                    msg
                }
            } = res.data
            if (status !== 200) {
                return this.$message.error(msg)
            }
            this.catelist = data.result
            this.total = data.total
        },
        // 监听pagesize改变
        handleSizeChange(newSize) {
            this.queryInfo.pagesize = newSize
            this.getCateList()
        },
        //监听pagenum的改变
        handleCurrentChange(newPage) {
            this.queryInfo.pagenum = newPage
            this.getCateList()
        },
        // 展示添加分类对话框
        showAddCateDialog() {
            this.getParentCateList()
            this.addCateDialogVisible = true
        },
        // 获取父级分类的数据列表
        async getParentCateList() {
            const res = await this.$http.get('categories', {
                params: {
                    type: 2,
                }
            })
            const {
                data,
                meta: {
                    msg,
                    status
                }
            } = res.data
            if (status !== 200) {
                return this.$message.error(msg)
            }
            this.parentCateList = data
        },
        // 选择项发生变化触发这个函数
        parentCateChanged() {
            console.log(this.selectedKeys);
            if (this.selectedKeys.length > 0) {
                // 父级分类的id
                this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
                // 为当前分类的等级赋值
                this.addCateForm.cat_level = this.selectedKeys.length
            } else {
                this.addCateForm.cat_pid = 0
                this.addCateForm.cat_level = 0
            }
        },
        // 点击按钮，添加新的分类
        addCate() {
            this.$refs.addCateFormRef.validate(async valid => {
                if (!valid) return
                const res = await this.$http.post('categories', this.addCateForm)
                const {
                    meta: {
                        status,
                        msg
                    }
                } = res.data
                if (status != 201) {
                    return this.$message.error(msg)
                }
                this.$message.success(msg)
                this.getCateList()
                this.addCateDialogVisible = false
            })
        },
        // 添加分类 重置表单
        addCateDialogClosed() {
            this.$refs.addCateFormRef.resetFields()
            this.selectedKeys = []
            this.addCateForm.cat_pid = 0
            this.addCateForm.cat_level = 0
        },
        // 删除分类
        async removeCate(id) {
            const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除！')
            }
            const {
                data: res
            } = await this.$http.delete('categories/' + id)
            if (res.meta.status !== 200) {
                return this.$message.error('删除商品分类失败！')
            }
            this.$message.success('删除商品分类成功！')
            this.getCateList()
        },
        // 显示编辑对话框
        async showEditCateDialog(id) {
            const {
                data: res
            } = await this.$http.get('categories/' + id)
            if (res.meta.status !== 200) return this.$message.error('获取分类失败！')
            this.editCateForm = res.data
            this.editCateDialogVisible = true
        },
        // 编辑分类名
        eidtCate() {
            this.$refs.editCateFormRef.validate(async valid => {
                if (!valid) return
                const {
                    data: res
                } = await this.$http.put('categories/' + this.editCateForm.cat_id, {
                    cat_name: this.editCateForm.cat_name
                })
                if (res.meta.status !== 200) return this.$message.error('更新分类名失败！')
                this.$message.success('更新分类名成功！')
                this.getCateList()
                this.editCateDialogVisible = false
            })
        }
    }
}
</script>

<style lang="less" scoped>
.el-card {
    margin-top: 20px;
}

.treetable {
    margin: 15px 0;
}
</style>
